Grey Cast Iron Grade 250

Grey Cast Iron Grade 250

Grey Cast Iron Grade 250 ISO9001 Certified Foundry With Good Quality Control Product Description and Process Grey Cast Iron Grade 250 ISO9001 Certified Foundry With Good Quality Control Production process: green sand casting process pre-coated sand casting process resin sand casting process...

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Grey Cast Iron Grade 250 ISO9001 Certified Foundry With Good Quality Control

Product Description and Process

Grey Cast Iron Grade 250 ISO9001 Certified Foundry With Good Quality Control


Production process:

green sand casting process

pre-coated sand casting process

resin sand casting process

Weight range: from 50 gram to 2,000 kilograms for ductile iron casting product


Machining process:

CNC machine, machining center, lathe, mill machine, drill machine, etc.


Surface treatment process:

paint coating, electrophoretic paint coating, electrogalvanizing coating, black oxide coating, phosphate treatment,  powder coating, etc.


Product Material and Uses

Normally production with gray iron HT200, HT250, ductile iron 65-45-12, 60-40-18, 80-55-06, 80-60-03, 100-70-03, etc.

The ductile iron casting products are widely used for Auto-cars, trains, trucks, vehicle components, mining machinery components, agricultural machinery parts, textile machinery parts, construction machinery parts, etc.


Gray/Grey Iron Classifications

In theUnited States, the most commonly used classification for gray iron is ASTM International standard A48.

This orders gray iron into classes which corresponds with its minimum tensile strength in thousands of pounds per square inch (ksi); e.g. class 20 gray irons has a minimum tensile strength of 20,000 psi (140 MPa). Class 20 has a high carbon equivalent and a ferrite matrix. Higher strength gray irons, up to class 40, have lower carbon equivalents and a pearlite matrix. Gray iron above class 40 requires alloying to provide solid solution strengthening, and heat treating is used to modify the matrix. Class 80 is the highest class available, but it is extremely brittle.

ASTM A247 is also commonly used to describe the graphite structure. Other ASTM standards that deal with gray iron include ASTM A126, ASTM A278, and ASTM A319.

In the automotive industry, the SAE International (SAE) standard SAE J431 is used to designate grades instead of classes. These grades are a measure of the tensile strength-to-Brinell hardness ratio.

The variation of the tensile modulus of elasticity of the various grades is a reflection of the percentage of graphite in the material as such material has neither strength nor stiffness and the space occupied by graphite acts like a void, thereby creating a spongy material.


Standard Specifications

Below is a reference chart of other ASTM standards affecting grey iron.

• ASTM A395 & ASME SA395: ferritic ductile iron pressure-retaining castings for use at elevated temperatures

• ASTM A439: austenitic ductile iron castings

• ASTM A476 & ASME SA476: ductile iron castings for paper mill dryer rolls

• ASTM A536 & SAE J434: ductile iron castings

• ASTM A571 & ASME SA571: austenitic ductile iron castings for pressure-containing parts suitable for low-temperature service

• ASTM A874: ferritic ductile iron castings suitable for low-temperature service

• ASTM A897: austempered ductile iron castings


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